<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script>
    var arr = 'abcdefg';
    var b = arr.concat("abc");
    console.log(b);// "abcdefgcde"该方法用来将不同字符串拼接在一起（数组也行）
</script>
</body>
</html>